PLEASE HELP! Complete the following tasks for this equation:
b/7.8 = - 2.15
a. Give an estimate for the solution. Be sure to explain how you arrived at the estimate, either by showing an equation or in words.
b. Solve the equation. Show or explain your work.
c. Compared to your estimate, is your answer reasonable? Explain your answer in complete sentences.

Itook a better photo of the question so y’all can see it i hope it’s a fine photo

Both the red and blue line segments stretch from the center of the circle to a point on the circle. the length of the blue segment is 5. how long is the red line segment?

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem